Category: Dev

Allocate Swift objects from Objective-C

Using mixed projects you can face with several challenging situations. One of them is the allocation of Swift objects in ObjC code. The general problem that Swift objects doesn’t have an alloc method which is used to allocate the memory in ObjC ([[SwiftClass alloc] init]). To access the Swift object you should prefix it with @objc – or subclass […]

Navigating back and forth among Viewcontrollers in Storyboard

In the old days if you wanted to present a ViewController you should call presentModal.. or push… in the code.  The problem with this approach is that if you want to modify the presentation you should change the code. To separate this Apple found out the Storyboard – all your ViewControllers in one place. Visually representing the […]

Coding Guidelines

General The main reason of this document is to help to achieve a clean code, which is: Readable: easily understandable – by other developers Maintainable: easily changeable by other developers as well Flexible: can be extended and add new functionality Testable: can be unit testable – where other classes are mocked even if the classes […]

iOS/ObjC Interview Questions

General programming questions OOP basics: what is a class, interface, instance variable, methods, static (class) methods vs instance methods. Header vs implementation files What is a process, thread design patterns and principles blackbox vs whitebox testing differences? unit testing? integration testing? regression testing? what is continuous integration? difference between stack/heap General ObjC [expand title=”What do […]

ObjC ivar/global var declaration – a clarification

You can declares iVar-s in header files but it’s better in the implementation, so they will be really invisible for others. You should do this way: @implementation MyClass { int firstiVar; } @synthesize anyProperty; But what if you forget the parenthesis and you put the variable simply beside the @synthesize? Like this: @implementation MyClass int […]